NEW YORK (AP), Dec 30 - A look at the best and worst performers in the Dow Jones industrial average, which tracks 30 key U.S. companies; the biggest industry gainers and decliners in the broader S&P 500 index, which ended nearly flat for the year; and some companies that rattled investors in 2011.

BEST OF THE DOW

- McDonald's Corp., up 31 percent. The burger chain has remodeled stores and added healthier items to menus in the U.S. while expanding abroad.

- IBM Corp., up 25 percent. The 100-year-old tech company sells high-margin software and technology services that can help corporations and governments cut costs.

- Pfizer Inc., up 24 percent. The world's largest drugmaker has been advancing new drugs to offset generic competition for Lipitor, the biggest-selling drug in history.

WORST OF THE DOW

- Bank of America Corp., down 58 percent. One of the country's largest financial institutions is still dealing with fallout from the housing meltdown.

- Alcoa Inc., down 44 percent. The aluminum producer is a barometer for the health of the global economy. Investors worried about a slowdown in China and a prolonged debt crisis in Europe.

- Hewlett-Packard Co., down 39 percent. The PC and printer maker struggled with executive dysfunction and indecisiveness on whether to sell its low-margin PC business.